AI agents call list_peripherals to retrieve information from Mcp Svd without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and enumerates hardware peripheral definitions from a static SVD (System View Description) hardware definition file. There are no side effects, no code execution, no data modification, and no irreversible actions. This is informational access only, making it a straightforward Read category tool with low severity and blast radius.
From the tool's definition Tool description states it 'List all peripherals defined in an ARM CMSIS SVD file' and 'Returns each peripheral' — this is purely a query/retrieval operation with no modifications, executions, or side effects.
Attacks that exploit this kind of access
List all peripherals defined in an ARM CMSIS SVD file. Returns each peripheral. It is categorised as a Read tool in the Mcp Svd MCP Server, which means it retrieves data without modifying state.
Register the Mcp Svd MCP server in PolicyLayer and add a rule for list_peripherals: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp Svd. Nothing to install.
list_peripherals is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_peripherals rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_peripherals. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_peripherals is provided by the Mcp Svd MCP server (pkt-lab/mcp-svd). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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